Spin-Polarized Two-Electron Spectroscopy of SurfacesThis book presents developments of techniques for detection and analysis of two electrons resulting from the interaction of a single incident electron with a solid surface. Spin dependence in scattering of spin polarized electrons from magnetic and non magnetic surfaces is governed by exchange and spin orbit effects. The effects of spin and angular electron momentum are shown through symmetry of experimental geometries: (i) normal and off normal